<template>
  <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import * as echarts from 'echarts';
require('echarts/theme/macarons') // echarts theme
import resize from './mixins/resize'

export default {
  mixins: [resize],
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '100%'
    },
    autoResize: {
      type: Boolean,
      default: true
    },
    chartData: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      chart: null
    }
  },
  watch: {
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val)
      }
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initChart()
    })
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')
      this.setOptions(this.chartData)
    },
    setOptions(val) {
      let legendData = []
      let seriesData = []
      if (!val) {
        val = {
          x_name: '',
          y_name: '',
          x_data: [],
          Series: []
        }
      } else {
        if (val.Series) {
          val.Series.forEach(item => {
            legendData.push(item.name)
            seriesData.push({
              name: item.name,
              type: 'scatter',
              data: item.data,
              emphasis: {
                focus: 'series',
                label: {
                  show: true,
                  formatter: function (param) {
                    return param.data[1].toFixed(2);
                  },
                  position: 'top'
                }
              },
            })
          })
        }
      }
      this.chart.setOption({
        xAxis: {
          axisLabel: {
            formatter: function(value) {
              return value.toFixed(1);
            }
          },
          splitLine: {
            lineStyle: {
              type: 'dashed'
            }
          }
        },
        grid: {
          left: 10,
          right: 10,
          bottom: 20,
          top: '20%',
          containLabel: true
        },
        yAxis: {
          name: val.y_name,
          axisLabel: {
            formatter: function(value) {
              return value.toFixed(1);
            }
          },
          splitLine: {
            lineStyle: {
              type: 'dashed'
            }
          },
          scale: true
        },
        legend: {
          data: legendData
        },
        series: seriesData
      })
    }
  }
}
</script>
